36 THE CONNECTICUT AGRICULTURAL 



Rejecting 763, the average estimated value of the other 32 

 nitrogenous superphosphates this year has been $38.69 and the 

 average cost $40.58 ; a difference in round numbers of $2.00. 



In 1881 the average cost, $43.00, exceeded the average esti- 

 mated value by $4.00, and in 1880 the average cost was $39.00, 

 $3.00 more than the estimated value. 



Special Fertilizers or "Formulas." 



On pages 34 and 35 will be found the analyses and valuations 

 of 23 samples of these fertilizers. In 10 of the number nitrogen 

 is present in three forms, as nitrates, ammonia, and in animal or 

 vegetable matter (" organic nitrogen.") 



In Mapes' Tobacco manures, (Connecticut brand, and for use 

 with stems) Nos. 767, 787, and 788 and in Forrester's Onion 

 Manure No. 821, most of the potash is present as sulphate. 



The estimated value of two articles of this class is very consid- 

 erably higher than their market price, in nine of them estimated 

 value and cost differ less than $5.00, while in the remainins; 1 2 

 the cost is a good deal higher than the estimated value. 



The average cost is $50.22; $3.29 more than the average esti- 

 mated value $46.93. In 1881 the average cost $48.40 exceeded the 

 estimated value by $4.80, and in 1880 the average cost, $48.00, 

 exceeded the estimated value by $3.35. 



On the following page is a comparison of the various corn, 

 tobacco and potato manures. 



The average composition of these manures is as follows :• 



Nitrogen. Phosphoric Acid. Potash. 



Corn manure, 4.32 8.93 7.34 



Tobacco manure, . 3.67 7.30 6.49 



Potato manure, 3.74 8.06 6.37 



The tobacco and potato manures — on the average — agree in 

 composition more closely than separate analyses of the same 

 brand of goods usually do. 



An examination of these analyses and those of special fertilizers 

 made in past years, abundantly justifies the conclusion that on 

 the farms of this State it is quite as rational to use a " Corn 

 manure" on potato land or a " potato manure" for the tobacco 

 crop, as in any other way. To attempt to construct a fertilizer 

 specially adapted to growing a particular crop on soils which 



